Travelling alone, the Doctor lands on a nameless planet in the far future where he meets a warrior woman named Leela, recently banished from her tribe, the Sevateem who recognise the Doctor as the "Evil One" and wish to destroy him.
On a nameless planet in the far future where invisible monsters prowl, the Doctor befriends a warrior woman named Leela, recently banished from her tribe, the Sevateem. She and everyone recognize the Doctor immediately. He is the Evil One who, in their mythology, holds their god Xoanon prisoner and must be destroyed.—Daniel Williamson & statmanjeff